T1A can be obtained easily though the monthly side quest. What type of T1 are you looking for?
I have 45 in overflow from spring cleaning.... but usually I’m t1a poor. Eq is a great source. Ally events too. T1a arena has 3 of them once a week.
Facing t1 catalyst drought for 3 star Shang-Chi?Same here.
Then the daily quest or glory store are the best ways to achieve them. Good luck on your rank up!